Paper/nms-patches/EntityLiving.patch

--- a/net/minecraft/server/EntityLiving.java
+++ b/net/minecraft/server/EntityLiving.java
@@ -9,6 +9,20 @@
 import java.util.Random;
 import java.util.UUID;
 
+// CraftBukkit start
+import java.util.ArrayList;
+import com.google.common.base.Function;
+import com.google.common.collect.Lists;
+import org.bukkit.craftbukkit.attribute.CraftAttributeMap;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.entity.Player;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntityDamageEvent.DamageModifier;
+import org.bukkit.event.entity.EntityRegainHealthEvent;
+import org.bukkit.event.player.PlayerItemConsumeEvent;
+// CraftBukkit end
+
 public abstract class EntityLiving extends Entity {
 
     private static final UUID a = UUID.fromString("662A6B8D-DA3E-4C1C-8813-96EA6097278D");
@@ -80,6 +94,12 @@
     protected int bn;
     protected int bo;
     private BlockPosition bC;
+    // CraftBukkit start
+    public int expToDrop;
+    public int maxAirTicks = 300;
+    ArrayList<org.bukkit.inventory.ItemStack> drops;
+     public org.bukkit.craftbukkit.attribute.CraftAttributeMap craftAttributes;
+    // CraftBukkit end
 
     public void Q() {
         this.damageEntity(DamageSource.OUT_OF_WORLD, Float.MAX_VALUE);
@@ -88,7 +108,8 @@
     public EntityLiving(World world) {
         super(world);
         this.initAttributes();
-        this.setHealth(this.getMaxHealth());
+        // CraftBukkit - setHealth(getMaxHealth()) inlined and simplified to skip the instanceof check for EntityPlayer, as getBukkitEntity() is not initialized in constructor
+        this.datawatcher.set(EntityLiving.HEALTH, (float) this.getAttributeInstance(GenericAttributes.maxHealth).getValue());
         this.i = true;
         this.aL = (float) ((Math.random() + 1.0D) * 0.009999999776482582D);
         this.setPosition(this.locX, this.locY, this.locZ);
@@ -125,7 +146,13 @@
                 double d1 = Math.min((double) (0.2F + f / 15.0F), 2.5D);
                 int i = (int) (150.0D * d1);
 
-                ((WorldServer) this.world).a(EnumParticle.BLOCK_DUST, this.locX, this.locY, this.locZ, i, 0.0D, 0.0D, 0.0D, 0.15000000596046448D, new int[] { Block.getCombinedId(iblockdata)});
+                // CraftBukkit start - visiblity api
+                if (this instanceof EntityPlayer) {
+                    ((WorldServer) this.world).sendParticles((EntityPlayer) this, EnumParticle.BLOCK_DUST, false, this.locX, this.locY, this.locZ, i, 0.0D, 0.0D, 0.0D, 0.15000000596046448D, new int[] { Block.getCombinedId(iblockdata)});
+                } else {
+                    ((WorldServer) this.world).a(EnumParticle.BLOCK_DUST, this.locX, this.locY, this.locZ, i, 0.0D, 0.0D, 0.0D, 0.15000000596046448D, new int[] { Block.getCombinedId(iblockdata)});
+                }
+                // CraftBukkit end
             }
         }
 
@@ -183,7 +210,11 @@
                     this.stopRiding();
                 }
             } else {
-                this.setAirTicks(300);
+                // CraftBukkit start - Only set if needed to work around a DataWatcher inefficiency
+                if (this.getAirTicks() != 300) {
+                    this.setAirTicks(maxAirTicks);
+                }
+                // CraftBukkit end
             }
 
             if (!this.world.isClientSide) {
@@ -240,6 +271,18 @@
         this.world.methodProfiler.b();
     }
 
+    // CraftBukkit start
+    public int getExpReward() {
+        int exp = this.getExpValue(this.killer);
+
+        if (!this.world.isClientSide && (this.lastDamageByPlayerTime > 0 || this.alwaysGivesExp()) && this.isDropExperience() && this.world.getGameRules().getBoolean("doMobLoot")) {
+            return exp;
+        } else {
+            return 0;
+        }
+    }
+    // CraftBukkit end
+
     protected void b(BlockPosition blockposition) {
         int i = EnchantmentManager.a(Enchantments.j, this);
 
@@ -255,19 +298,19 @@
 
     protected void bC() {
         ++this.deathTicks;
-        if (this.deathTicks == 20) {
+        if (this.deathTicks >= 20 && !this.dead) { // CraftBukkit - (this.deathTicks == 20) -> (this.deathTicks >= 20 && !this.dead)
             int i;
 
-            if (!this.world.isClientSide && (this.alwaysGivesExp() || this.lastDamageByPlayerTime > 0 && this.isDropExperience() && this.world.getGameRules().getBoolean("doMobLoot"))) {
-                i = this.getExpValue(this.killer);
+            // CraftBukkit start - Update getExpReward() above if the removed if() changes!
+            i = this.expToDrop;
+            while (i > 0) {
+                int j = EntityExperienceOrb.getOrbValue(i);
 
-                while (i > 0) {
-                    int j = EntityExperienceOrb.getOrbValue(i);
-
-                    i -= j;
-                    this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY, this.locZ, j));
-                }
+                i -= j;
+                this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY, this.locZ, j));
             }
+            this.expToDrop = 0;
+            // CraftBukkit end
 
             this.die();
 
@@ -421,6 +464,17 @@
             }
         }
 
+        // CraftBukkit start
+        if (nbttagcompound.hasKey("Bukkit.MaxHealth")) {
+            NBTBase nbtbase = nbttagcompound.get("Bukkit.MaxHealth");
+            if (nbtbase.getTypeId() == 5) {
+                this.getAttributeInstance(GenericAttributes.maxHealth).setValue((double) ((NBTTagFloat) nbtbase).c());
+            } else if (nbtbase.getTypeId() == 3) {
+                this.getAttributeInstance(GenericAttributes.maxHealth).setValue((double) ((NBTTagInt) nbtbase).d());
+            }
+        }
+        // CraftBukkit end
+
         if (nbttagcompound.hasKeyOfType("Health", 99)) {
             this.setHealth(nbttagcompound.getFloat("Health"));
         }
@@ -436,9 +490,15 @@
 
     }
 
+    // CraftBukkit start
+    private boolean isTickingEffects = false;
+    private List<Object> effectsToProcess = Lists.newArrayList();
+    // CraftBukkit end
+
     protected void tickPotionEffects() {
         Iterator iterator = this.effects.keySet().iterator();
 
+        isTickingEffects = true; // CraftBukkit
         while (iterator.hasNext()) {
             MobEffectList mobeffectlist = (MobEffectList) iterator.next();
             MobEffect mobeffect = (MobEffect) this.effects.get(mobeffectlist);
@@ -452,6 +512,16 @@
                 this.a(mobeffect, false);
             }
         }
+        // CraftBukkit start
+        isTickingEffects = false;
+        for (Object e : effectsToProcess) {
+            if (e instanceof MobEffect) {
+                addEffect((MobEffect) e);
+            } else {
+                removeEffect((MobEffectList) e);
+            }
+        }
+        // CraftBukkit end
 
         if (this.updateEffects) {
             if (!this.world.isClientSide) {
@@ -548,6 +618,12 @@
     }
 
     public void addEffect(MobEffect mobeffect) {
+        // CraftBukkit start
+        if (isTickingEffects) {
+            effectsToProcess.add(mobeffect);
+            return;
+        }
+        // CraftBukkit end
         if (this.d(mobeffect)) {
             MobEffect mobeffect1 = (MobEffect) this.effects.get(mobeffect.getMobEffect());
 
@@ -579,6 +655,12 @@
     }
 
     public MobEffect c(MobEffectList mobeffectlist) {
+        // CraftBukkit start
+        if (isTickingEffects) {
+            effectsToProcess.add(mobeffectlist);
+            return null;
+        }
+        // CraftBukkit end
         return (MobEffect) this.effects.remove(mobeffectlist);
     }
 
@@ -618,20 +700,52 @@
 
     }
 
+    // CraftBukkit start - Delegate so we can handle providing a reason for health being regained
     public void heal(float f) {
+        heal(f, EntityRegainHealthEvent.RegainReason.CUSTOM);
+    }
+
+    public void heal(float f, EntityRegainHealthEvent.RegainReason regainReason) {
         float f1 = this.getHealth();
 
         if (f1 > 0.0F) {
-            this.setHealth(f1 + f);
+            EntityRegainHealthEvent event = new EntityRegainHealthEvent(this.getBukkitEntity(), f, regainReason);
+            this.world.getServer().getPluginManager().callEvent(event);
+
+            if (!event.isCancelled()) {
+                this.setHealth((float) (this.getHealth() + event.getAmount()));
+            }
+            // CraftBukkit end
         }
 
     }
 
     public final float getHealth() {
+        // CraftBukkit start - Use unscaled health
+        if (this instanceof EntityPlayer) {
+            return (float) ((EntityPlayer) this).getBukkitEntity().getHealth();
+        }
+        // CraftBukkit end
         return ((Float) this.datawatcher.get(EntityLiving.HEALTH)).floatValue();
     }
 
     public void setHealth(float f) {
+        // CraftBukkit start - Handle scaled health
+        if (this instanceof EntityPlayer) {
+            org.bukkit.craftbukkit.entity.CraftPlayer player = ((EntityPlayer) this).getBukkitEntity();
+            // Squeeze
+            if (f < 0.0F) {
+                player.setRealHealth(0.0D);
+            } else if (f > player.getMaxHealth()) {
+                player.setRealHealth(player.getMaxHealth());
+            } else {
+                player.setRealHealth(f);
+            }
+
+            this.datawatcher.set(EntityLiving.HEALTH, Float.valueOf(player.getScaledHealth()));
+            return;
+        }
+        // CraftBukkit end
         this.datawatcher.set(EntityLiving.HEALTH, Float.valueOf(MathHelper.a(f, 0.0F, this.getMaxHealth())));
     }
 
@@ -647,7 +761,8 @@
             } else if (damagesource.o() && this.hasEffect(MobEffects.FIRE_RESISTANCE)) {
                 return false;
             } else {
-                if ((damagesource == DamageSource.ANVIL || damagesource == DamageSource.FALLING_BLOCK) && this.getEquipment(EnumItemSlot.HEAD) != null) {
+                // CraftBukkit - Moved into damageEntity0(DamageSource, float)
+                if (false && (damagesource == DamageSource.ANVIL || damagesource == DamageSource.FALLING_BLOCK) && this.getEquipment(EnumItemSlot.HEAD) != null) {
                     this.getEquipment(EnumItemSlot.HEAD).damage((int) (f * 4.0F + this.random.nextFloat() * f * 2.0F), this);
                     f *= 0.75F;
                 }
@@ -673,19 +788,38 @@
 
                 if ((float) this.noDamageTicks > (float) this.maxNoDamageTicks / 2.0F) {
                     if (f <= this.lastDamage) {
+                        this.forceExplosionKnockback = true; // CraftBukkit - SPIGOT-949 - for vanilla consistency, cooldown does not prevent explosion knockback
                         return false;
                     }
 
-                    this.damageEntity0(damagesource, f - this.lastDamage);
+                    // CraftBukkit start
+                    if (!this.damageEntity0(damagesource, f - this.lastDamage)) {
+                        return false;
+                    }
+                    // CraftBukkit end
                     this.lastDamage = f;
                     flag1 = false;
                 } else {
+                    // CraftBukkit start
+                    if (!this.damageEntity0(damagesource, f)) {
+                        return false;
+                    }
                     this.lastDamage = f;
                     this.noDamageTicks = this.maxNoDamageTicks;
-                    this.damageEntity0(damagesource, f);
+                    // this.damageEntity0(damagesource, f);
+                    // CraftBukkit end
                     this.hurtTicks = this.ay = 10;
                 }
 
+                // CraftBukkit start
+                if(this instanceof EntityAnimal){
+                    ((EntityAnimal)this).resetLove(); 
+                    if(this instanceof EntityTameableAnimal){
+                        ((EntityTameableAnimal)this).getGoalSit().setSitting(false);
+                    }
+                }
+                // CraftBukkit end
+
                 this.az = 0.0F;
                 Entity entity = damagesource.getEntity();
 
@@ -822,9 +956,16 @@
                 }
 
                 if (this.isDropExperience() && this.world.getGameRules().getBoolean("doMobLoot")) {
+                    this.drops = new ArrayList<org.bukkit.inventory.ItemStack>(); // CraftBukkit - Setup drop capture
                     boolean flag = this.lastDamageByPlayerTime > 0;
 
                     this.a(flag, i, damagesource);
+                    // CraftBukkit start - Call death event
+                    CraftEventFactory.callEntityDeathEvent(this, this.drops);
+                    this.drops = null;
+                } else {
+                    CraftEventFactory.callEntityDeathEvent(this);
+                    // CraftBukkit end
                 }
             }
 
@@ -912,8 +1053,13 @@
         int i = MathHelper.f((f - 3.0F - f2) * f1);
 
         if (i > 0) {
+            // CraftBukkit start
+            if (!this.damageEntity(DamageSource.FALL, (float) i)) {
+                return;
+            }
+            // CraftBukkit end
             this.a(this.e(i), 1.0F, 1.0F);
-            this.damageEntity(DamageSource.FALL, (float) i);
+            // this.damageEntity(DamageSource.FALL, (float) i); // CraftBukkit - moved up
             int j = MathHelper.floor(this.locX);
             int k = MathHelper.floor(this.locY - 0.20000000298023224D);
             int l = MathHelper.floor(this.locZ);
@@ -940,20 +1086,20 @@
 
     protected float applyArmorModifier(DamageSource damagesource, float f) {
         if (!damagesource.ignoresArmor()) {
-            this.damageArmor(f);
+            // this.damageArmor(f); // CraftBukkit - Moved into damageEntity0(DamageSource, float)
             f = CombatMath.a(f, (float) this.getArmorStrength());
         }
 
         return f;
     }
-
     protected float applyMagicModifier(DamageSource damagesource, float f) {
         if (damagesource.isStarvation()) {
             return f;
         } else {
             int i;
 
-            if (this.hasEffect(MobEffects.RESISTANCE) && damagesource != DamageSource.OUT_OF_WORLD) {
+            // CraftBukkit - Moved to damageEntity0(DamageSource, float)
+            if (false && this.hasEffect(MobEffects.RESISTANCE) && damagesource != DamageSource.OUT_OF_WORLD) {
                 i = (this.getEffect(MobEffects.RESISTANCE).getAmplifier() + 1) * 5;
                 int j = 25 - i;
                 float f1 = f * (float) j;
@@ -974,22 +1120,122 @@
         }
     }
 
-    protected void damageEntity0(DamageSource damagesource, float f) {
-        if (!this.isInvulnerable(damagesource)) {
-            f = this.applyArmorModifier(damagesource, f);
-            f = this.applyMagicModifier(damagesource, f);
-            float f1 = f;
+    // CraftBukkit start
+    protected boolean damageEntity0(final DamageSource damagesource, float f) { // void -> boolean, add final
+       if (!this.isInvulnerable(damagesource)) {
+            final boolean human = this instanceof EntityHuman;
+            float originalDamage = f;
+            Function<Double, Double> hardHat = new Function<Double, Double>() {
+                @Override
+                public Double apply(Double f) {
+                    if ((damagesource == DamageSource.ANVIL || damagesource == DamageSource.FALLING_BLOCK) && EntityLiving.this.getEquipment(EnumItemSlot.HEAD) != null) {
+                        return -(f - (f * 0.75F));
 
-            f = Math.max(f - this.getAbsorptionHearts(), 0.0F);
-            this.setAbsorptionHearts(this.getAbsorptionHearts() - (f1 - f));
+                    }
+                    return -0.0;
+                }
+            };
+            float hardHatModifier = hardHat.apply((double) f).floatValue();
+            f += hardHatModifier;
+
+            Function<Double, Double> blocking = new Function<Double, Double>() {
+                @Override
+                public Double apply(Double f) {
+                    if (human) {
+                        if (!damagesource.ignoresArmor() && ((EntityHuman) EntityLiving.this).isBlocking() && f > 0.0F) {
+                            return -(f - ((1.0F + f) * 0.5F));
+                        }
+                    }
+                    return -0.0;
+                }
+            };
+            float blockingModifier = blocking.apply((double) f).floatValue();
+            f += blockingModifier;
+
+            Function<Double, Double> armor = new Function<Double, Double>() {
+                @Override
+                public Double apply(Double f) {
+                    return -(f - EntityLiving.this.applyArmorModifier(damagesource, f.floatValue()));
+                }
+            };
+            float armorModifier = armor.apply((double) f).floatValue();
+            f += armorModifier;
+
+            Function<Double, Double> resistance = new Function<Double, Double>() {
+                @Override
+                public Double apply(Double f) {
+                    if (!damagesource.isStarvation() && EntityLiving.this.hasEffect(MobEffects.RESISTANCE) && damagesource != DamageSource.OUT_OF_WORLD) {
+                        int i = (EntityLiving.this.getEffect(MobEffects.RESISTANCE).getAmplifier() + 1) * 5;
+                        int j = 25 - i;
+                        float f1 = f.floatValue() * (float) j;
+                        return -(f - (f1 / 25.0F));
+                    }
+                    return -0.0;
+                }
+            };
+            float resistanceModifier = resistance.apply((double) f).floatValue();
+            f += resistanceModifier;
+
+            Function<Double, Double> magic = new Function<Double, Double>() {
+                @Override
+                public Double apply(Double f) {
+                    return -(f - EntityLiving.this.applyMagicModifier(damagesource, f.floatValue()));
+                }
+            };
+            float magicModifier = magic.apply((double) f).floatValue();
+            f += magicModifier;
+
+            Function<Double, Double> absorption = new Function<Double, Double>() {
+                @Override
+                public Double apply(Double f) {
+                    return -(Math.max(f - Math.max(f - EntityLiving.this.getAbsorptionHearts(), 0.0F), 0.0F));
+                }
+            };
+            float absorptionModifier = absorption.apply((double) f).floatValue();
+
+            EntityDamageEvent event = CraftEventFactory.handleLivingEntityDamageEvent(this, damagesource, originalDamage, hardHatModifier, blockingModifier, armorModifier, resistanceModifier, magicModifier, absorptionModifier, hardHat, blocking, armor, resistance, magic, absorption);
+            if (event.isCancelled()) {
+                return false;
+            }
+
+            f = (float) event.getFinalDamage();
+
+            // Apply damage to helmet
+            if ((damagesource == DamageSource.ANVIL || damagesource == DamageSource.FALLING_BLOCK) && this.getEquipment(EnumItemSlot.HEAD) != null) {
+                this.getEquipment(EnumItemSlot.HEAD).damage((int) (event.getDamage() * 4.0F + this.random.nextFloat() * event.getDamage() * 2.0F), this);
+            }
+
+            // Apply damage to armor
+            if (!damagesource.ignoresArmor()) {
+                float armorDamage = (float) (event.getDamage() + event.getDamage(DamageModifier.BLOCKING) + event.getDamage(DamageModifier.HARD_HAT));
+                this.damageArmor(armorDamage);
+            }
+
+            absorptionModifier = (float) -event.getDamage(DamageModifier.ABSORPTION);
+            this.setAbsorptionHearts(Math.max(this.getAbsorptionHearts() - absorptionModifier, 0.0F));
             if (f != 0.0F) {
+                if (human) {
+                    // PAIL: Be sure to drag all this code from the EntityHuman subclass each update.
+                    ((EntityHuman) this).applyExhaustion(damagesource.getExhaustionCost());
+                    if (f < 3.4028235E37F) {
+                        ((EntityHuman) this).a(StatisticList.z, Math.round(f * 10.0F));
+                    }
+                }
+                // CraftBukkit end
                 float f2 = this.getHealth();
 
                 this.setHealth(f2 - f);
                 this.getCombatTracker().trackDamage(damagesource, f2, f);
+                // CraftBukkit start
+                if (human) {
+                    return true;
+                }
+                // CraftBukkit end
                 this.setAbsorptionHearts(this.getAbsorptionHearts() - f);
             }
+            return true;
         }
+        return false; // CraftBukkit
     }
 
     public CombatTracker getCombatTracker() {
@@ -1055,6 +1301,7 @@
     public AttributeMapBase getAttributeMap() {
         if (this.bp == null) {
             this.bp = new AttributeMapServer();
+            this.craftAttributes = new CraftAttributeMap(bp); // CraftBukkit
         }
 
         return this.bp;
@@ -1702,6 +1949,13 @@
         if (!list.isEmpty()) {
             for (int i = 0; i < list.size(); ++i) {
                 Entity entity = (Entity) list.get(i);
+                // TODO better check now?
+                // CraftBukkit start - Only handle mob (non-player) collisions every other tick
+                if (entity instanceof EntityLiving && !(this instanceof EntityPlayer) && this.ticksLived % 2 == 0) {
+                    continue;
+                }
+                // CraftBukkit end
+
 
                 this.C(entity);
             }
@@ -1918,7 +2172,22 @@
     protected void v() {
         if (this.bm != null && this.cs()) {
             this.a(this.bm, 16);
-            ItemStack itemstack = this.bm.a(this.world, this);
+            // CraftBukkit start - fire PlayerItemConsumeEvent
+            org.bukkit.inventory.ItemStack craftItem = CraftItemStack.asBukkitCopy(this.bm); // PAIL: rename
+            PlayerItemConsumeEvent event = new PlayerItemConsumeEvent((Player) this.getBukkitEntity(), craftItem);
+            world.getServer().getPluginManager().callEvent(event);
+
+            if (event.isCancelled()) {
+                // Update client
+                if (this instanceof EntityPlayer) {
+                    ((EntityPlayer) this).getBukkitEntity().updateInventory();
+                    ((EntityPlayer) this).getBukkitEntity().updateScaledHealth();
+                }
+                return;
+            }
+
+            ItemStack itemstack = (craftItem.equals(event.getItem())) ? this.bm.a(this.world, this) : CraftItemStack.asNMSCopy(event.getItem()).a(world, this);
+            // CraftBukkit end
 
             if (itemstack != null && itemstack.count == 0) {
                 itemstack = null;